EP0832680B1 - Procédé pour la purification de gaz d'échappement d'appareils de chauffage pour combustibles fossiles - Google Patents

Procédé pour la purification de gaz d'échappement d'appareils de chauffage pour combustibles fossiles Download PDF

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Publication number
EP0832680B1
EP0832680B1 EP97113945A EP97113945A EP0832680B1 EP 0832680 B1 EP0832680 B1 EP 0832680B1 EP 97113945 A EP97113945 A EP 97113945A EP 97113945 A EP97113945 A EP 97113945A EP 0832680 B1 EP0832680 B1 EP 0832680B1
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EP
European Patent Office
Prior art keywords
waste gas
liquid
water
absorption tower
process according
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP97113945A
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German (de)
English (en)
Other versions
EP0832680A3 (fr
EP0832680A2 (fr
Inventor
Theo Dipl.-Phys. Risse
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Lurgi Lentjes Bischoff GmbH
Original Assignee
Lurgi Lentjes Bischoff GmbH
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Publication of EP0832680A3 publication Critical patent/EP0832680A3/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/46—Removing components of defined structure
    • B01D53/48—Sulfur compounds
    • B01D53/50—Sulfur oxides
    • B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
    • B01D53/502—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound characterised by a specific solution or suspension

Definitions

  • Such a method is known from DE-U 295 17 698.9. It is used to remove sulfur dioxide.
  • the process uses the bicarbonates contained in seawater to convert the absorbed SO 2 into harmless calcium and magnesium sulfates. Calcium and magnesium sulfates are natural components of sea water, so that the discharge of the reaction products resulting from SO 2 absorption into the sea is harmless.
  • the clean gas values that can be achieved with gas scrubbing with sea water also meet the requirement.
  • fine dust and aerosols that have passed through an upstream electrostatic precipitator are also separated. They are carriers of heavy metals and are carried into the sea with the washing liquid.
  • the washing liquid absorbs gaseous and vaporous emissions, including in particular mercury, which are discharged into the sea with the washing liquid without elimination or detoxification.
  • the discharge of heavy metal emissions from the flue gas of a combustion plant into the sea is questionable.
  • the invention has for its object in the beginning described method the heavy metal pollution ins Reduce sea-derived washing liquid.
  • the invention teaches that Exhaust gas before entering the absorption tower in one Prewashers are washed with water, all in one the liquid circuit in the circuit assigned to the pre-washer is led and dusts, aerosols and vapor Heavy metal emissions from the exhaust, and that one concentrate stream enriched with the absorbed pollutants withdrawn from the fluid circuit as well disposed of and removed from the liquid circuit Amount of liquid is replaced by fresh water.
  • the liquid circuit of the pre-washer Sea water supplied as fresh water. - The invention Process enables an effective separation of Heavy metal emissions from the exhaust gas and enrichment of these pollutants in the fluid circuit that the Prewashers is assigned.
  • the concentrate stream discharged from the liquid circuit is very small compared to the amount of liquid circulated in the liquid circuit.
  • the pH of the circulating liquid drops due to the emissions absorbed by the exhaust gas and is in the strongly acidic range. Heavy metal deposition does not suffer from this. Heavy metals and especially mercury dissolve in chloride form (HgCl 2 ).
  • HgCl 2 chloride form
  • the invention teaches that Exhaust gas in an expanded horizontal pipe section of the connected to the entrance of the absorption tower Exhaust gas duct with the one in the liquid circuit Water is applied, the water and the exhaust gas be carried out in cross flow and the exhaust gas through a curtain of drops of liquid enters.
  • the mass ratio of the circulated liquid flow and of the exhaust gas is preferably 3 to 4.
  • the method according to the invention there are various Ways to get out of the fluid cycle of the pre-washer discharged concentrate stream dispose. It is within the scope of the invention Feed the concentrate stream to a wastewater treatment plant. If there is no wastewater treatment plant, it can the concentrate stream for the purpose of disposal of the fuel be added, which is then burned. The the fuel by abandoning the concentrate stream supplied heavy metals and heavy metal compounds fall when operating the furnace - essentially bound to ashes or fly ash - out again. Ashes and Fly ash represent sinks to those in the fluid circuit of the pre-washer separated pollutants to remove the entire system.
  • One more way for the disposal of the concentrate stream according to the invention is that the concentrate stream for moistening Ash is used in the operation of the furnace arises. The ashes, the heavy metals that can be eluted anyway and contains heavy metal compounds, can according to the Humidification by the concentrate stream in a known manner Disposed of way.
  • the basic structure of the system includes: Absorption tower 1, the liquid sump 2 a ventilation device 3, a post-reaction basin 4 and a pre-scrubber 5.
  • the exhaust gas to be cleaned is in the absorption tower 1 with sea water. That with Sea water containing sulfur compounds is extracted from the vented liquid sump 2 deducted and for the purpose sulfate formation and neutralization in the after-reaction tank 4 mixed with fresh sea water and then returned to the sea.
  • the pre-washer 5 consists of an expanded horizontal Pipe section 6 of the entrance to the absorption tower 1 connected exhaust duct.
  • the pre-washer is a liquid circuit 7 with drain tank 8, circulation pump 9 and spray nozzles 10 assigned.
  • Exit side is the pre-washer with a droplet separator equipped to prevent liquid drops from entering prevented the absorption tower 1.
  • the exhaust gas Before entering the absorption tower 1, the exhaust gas is washed in the pre-scrubber 5 with sea water, which is circulated in the liquid circuit 7 and absorbs dust, aerosols and vaporous heavy metal emissions from the exhaust gas. Aerosols mean particles with a particle diameter of less than 1 ⁇ m. Dusts are to be understood to mean particles up to 500 ⁇ m, but in particular particles from 1 to 10 ⁇ m.
  • a concentrate stream 12 enriched with the absorbed pollutants is withdrawn from the liquid circuit 7 and disposed of. The amount of liquid withdrawn from the liquid circuit 7 is replaced by fresh water 13.
  • the water used for the pre-wash and the exhaust gas are conducted in a cross flow, the exhaust gas passing through a curtain of liquid drops.
  • a liquid / gas mass ratio of 3 to 4 is usually set in the pre-washer 5.
  • the concentrate stream 12 discharged from the liquid circuit 7 is very small compared to the amount of liquid circulated.
  • the pollutant concentration in the liquid circuit can be set and regulated. Due to the pollutant emissions absorbed from the exhaust gas, a pH value in the acidic range is established in the liquid circuit, which does not impair the heavy metal separation. At low pH, mercury can be selectively washed out in the form of HgCl 2 .
  • the disposal of the concentrate stream 12 can be carried out in various ways Way. It is within the scope of the invention Concentrate stream of a wastewater treatment plant, not shown feed. There is also the possibility the concentrate stream for fuel disposal admit, which is then burned. The third possibility is to concentrate the stream Use humidification of ash when operating the Firing system arises.
  • the exhaust gas is in front of the pre-scrubber 5 in a heat exchanger 14 with the clean gas drawn off from the absorption tower 1 chilled. It can also be an electrostatic filter system (not shown) be provided in which the exhaust gas before Entry into the pre-washer 5 is pre-cleaned.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Biomedical Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Analytical Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Treating Waste Gases (AREA)

Claims (7)

  1. Procédé d'épuration des gaz de combustion dans une installation de chauffe utilisant des combustibles fossiles, en particulier dans une centrale au charbon, dans lequel
    les gaz de combustion sont soumis à un lavage avec de l'eau de mer dans une tour d'absorption, et
    l'eau de mer chargée en composés soufrés est prélevée dans une cuve ventilée de collecte de liquide de la tour d'absorption, est mélangée à de l'eau de mer fraíche à des fins de formation de sulfates et de neutralisation dans un bassin de post-réaction, puis est rejetée dans la mer,
    caractérisé en ce que les gaz de combustion, avant leur entrée dans la tour d'absorption, sont lavés dans un dispositif de prélavage avec de l'eau qui circule en circuit fermé exclusivement dans un circuit de liquide associé au dispositif de prélavage, en ce qu'un flux de concentrat chargé en substances toxiques récupérées est prélevé sur le circuit de liquidé et éliminé, en ce que le volume de liquide prélevé sur le circuit de liquide est complété avec de l'eau fraíche et en ce que de l'eau de mer est introduite comme eau fraíche dans le circuit de liquide du dispositif de prélavage.
  2. Procédé selon la revendication 1, caractérisé en ce que les gaz de combustion sont lavés avec l'eau introduite dans le circuit de liquide, dans un tronçon de tuyauterie horizontal du conduit de gaz de combustion connecté à l'entrée de la tour d'absorption, l'eau et les gaz de combustion étant introduits en des flux croisés et les gaz de combustion traversant un rideau de gouttelettes de liquide.
  3. Procédé selon une des revendications 1 à 2, caractérisé en ce que le rapport massique (L/G) du débit de liquide circulant en circuit fermé et des gaz de combustion est de 3 à 4.
  4. Procédé selon une des revendications 1 à 3, caractérisé en ce que le débit de concentrât, à des fins d'élimination, est ajouté au combustible qui est ensuite brûlé.
  5. Procédé selon une des revendications 1 à 3, caractérisé en ce que le débit de concentrat est utilisé pour mouiller les cendres générées par l'exploitation de l'installation de chauffe
  6. Procédé selon une des revendications 1 à 5, caractérisé en ce que les gaz de combustion, avant le dispositif de prélavage, sont refroidis par échange indirect de chaleur avec le gaz épuré, extrait de la tour d'absorption.
  7. Procédé selon une des revendications 1 à, caractérisé en ce que les gaz de combustion, avant leur entrée dans le dispositif de prélavage, sont soumis à une épuration préalable dans un électrofiltre.
EP97113945A 1996-09-21 1997-08-13 Procédé pour la purification de gaz d'échappement d'appareils de chauffage pour combustibles fossiles Expired - Lifetime EP0832680B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19638844A DE19638844A1 (de) 1996-09-21 1996-09-21 Verfahren zum Reinigen von Abgas aus Feuerungsanlagen für fossile Brennstoffe
DE19638844 1996-09-21

Publications (3)

Publication Number Publication Date
EP0832680A2 EP0832680A2 (fr) 1998-04-01
EP0832680A3 EP0832680A3 (fr) 1998-07-29
EP0832680B1 true EP0832680B1 (fr) 2001-12-12

Family

ID=7806515

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97113945A Expired - Lifetime EP0832680B1 (fr) 1996-09-21 1997-08-13 Procédé pour la purification de gaz d'échappement d'appareils de chauffage pour combustibles fossiles

Country Status (4)

Country Link
EP (1) EP0832680B1 (fr)
DE (2) DE19638844A1 (fr)
DK (1) DK0832680T3 (fr)
ES (1) ES2164970T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110252107B (zh) * 2019-05-17 2022-02-15 山东恒力新能源工程有限公司 一种适用于火力发电厂的脱硫装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5597225A (en) * 1979-01-18 1980-07-24 Mitsubishi Heavy Ind Ltd Treating method of waste liquid in treatment of exhaust gas
DE3320466A1 (de) * 1983-06-07 1984-12-13 Kernforschungszentrum Karlsruhe Gmbh, 7500 Karlsruhe Verfahren zur reinigung von rauchgas
DE3603511A1 (de) * 1986-02-05 1987-08-06 Standard Elektrik Lorenz Ag Verfahren und vorrichtung zur entfernung von staub- und gasfoermigen schadstoffen aus abgasen, insbesondere abgasen bei der lichtwellenleiter-vorformherstellung
DE3721684A1 (de) * 1987-07-01 1989-01-12 Krc Umwelttechnik Gmbh Verfahren zum nassen entfernen von schwefeldioxid
CS206990A2 (en) * 1989-05-02 1991-09-15 Chiyoda Chem Eng Construct Co Method of waste gas cleaning that contains dust and chemical impurities and equipment for this method realization
CA2030480A1 (fr) * 1989-12-12 1991-06-13 William Downs Procede de lavage pour le controle des chlorures dans les centrales a combustible fossile
DE4415194A1 (de) * 1994-04-30 1994-09-22 Jozef Konopka Methode der Reduktion der Quecksilberemissionen in Verbrennungsanlagen mit nassen Rauchgasreinigungsverfahren
DE19502066A1 (de) * 1995-01-16 1996-08-01 Ver Energiewerke Ag Herstellung einer Kalkhydrat-Suspension
DE29517697U1 (de) * 1995-07-29 1996-01-18 Gottfried Bischoff Gmbh & Co Rauchgasentschwefelungsanlage

Also Published As

Publication number Publication date
EP0832680A3 (fr) 1998-07-29
DE59705751D1 (de) 2002-01-24
ES2164970T3 (es) 2002-03-01
DE19638844A1 (de) 1998-04-02
EP0832680A2 (fr) 1998-04-01
DK0832680T3 (da) 2002-03-18

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